CN106301733B

CN106301733B - Data transmission method and device

Info

Publication number: CN106301733B
Application number: CN201510366754.3A
Authority: CN
Inventors: 李新彩; 苟伟; 赵亚军
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2015-06-26
Filing date: 2015-06-26
Publication date: 2020-11-20
Anticipated expiration: 2035-06-26
Also published as: CN106301733A; EP3316650A1; EP3316650A4; WO2016206483A1; US20180192442A1

Abstract

The invention provides a data transmission method and a device, wherein the method comprises the following steps: a base station sends a configuration signaling to User Equipment (UE), wherein the configuration signaling carries a parameter of a Clear Channel Assessment (CCA) of the UE and a parameter of uplink transmission of the UE; and the base station receives uplink data sent by the UE according to the configuration signaling. The invention solves the problems of how to carry out LBT and realize multi-user frequency multiplexing of the uplink UE when the LTE system operates in the unlicensed carrier frequency band in the related art, and improves the frequency spectrum efficiency.

Description

Data transmission method and device

Technical Field

The present invention relates to the field of communications, and in particular, to a data transmission method and apparatus.

Background

In the Evolution process of Long Term Evolution (Long Term Evolution, LTE for short), LTE Rel-13 release started to make a research in 2014, 9, where one important content is that the LTE system uses an unlicensed carrier for operation. The technology enables the LTE system to use the existing unlicensed carrier, greatly improves the potential spectrum resources of the LTE system, and enables the LTE system to obtain lower spectrum cost.

However, LTE uses unlicensed carriers and faces a number of problems, and first, in some countries and regions, there are corresponding regulatory policies for the use of unlicensed spectrum. For example, for Listen Before Talk (Listen Before Talk, abbreviated as LBT), also called Clean Channel Assessment (CCA), two are defined, one being frame based FB and the other being load based LBE. For the FBE mode, the CCA position of a station is fixed every time, and only one initial CCA needs to be performed, so that the timing is easy, and stations of the same operator can implement co-frequency multiplexing by deployment. And the occupied time of each transmission is also fixed without random backoff. For the LBE mode, the station may start CCA from any time, may start CCA if there is a load, and may randomly determine the transmission time length according to the load as long as the transmission time length is within the maximum occupation time. But multi-site or for LTE uplink multi-user frequency reuse is difficult. At present, how the UE performs LBT and a frame structure of data transmission for uplink data transmission in the unlicensed operation of LTE have not been determined yet.

For a licensed-assisted Access (LAA) uplink, when a same base station schedules multiple users, the following problems may occur: under the condition that users execute LBT asynchronization, if a first user which successfully competes immediately sends data after CCA is finished, CCA detection of other user equipment UE on a channel fails, namely other UE cannot transmit uplink data, and the uplink multi-user multiplexing is difficult to realize.

In addition, when the subframe is an uplink subframe where the SRS is transmitted, if a Sounding Reference Signal (SRS) is still transmitted in the last symbol, CCA detection of other users may be affected. How to design the SRS subframe structure is also a problem to be solved in the case of ensuring SRS transmission, and meanwhile, the CCA detection of other users is not hindered or the next scheduling subframe is ensured to perform data multiplexing transmission.

In view of the above problems in the related art, no effective solution has been proposed.

Disclosure of Invention

The main objective of the present invention is to provide a data transmission method and apparatus, so as to solve at least the problem of how to perform LBT and implement multi-user frequency multiplexing for uplink UE when an LTE system operates in an unlicensed carrier frequency band in the related art.

According to an aspect of the present invention, there is provided a data transmission method, including: a base station sends a configuration signaling to the UE, wherein the configuration signaling carries parameters of a CCA (clear channel assessment) of the UE and parameters of uplink transmission of the UE; and the base station receives uplink data sent by the UE according to the configuration signaling.

Further, the parameters of the CCA and the parameters of the uplink transmission include at least one of: configuring, by the base station, a symbol position where the CCA starts, an extended CCA backoff value N, and a window length CW of the CCA for the UE; and the base station configures carrier indication information and subframe position indication information for data transmission on an unauthorized carrier, the position and number of PRBs (physical resource blocks) allocated to each subframe, a Modulation and Coding Strategy (MCS) and a hybrid automatic repeat request (HARQ) process number for the UE.

Further, the parameters of the CCA and the parameters of the uplink transmission are determined by one of: the base station determines the CCA parameters, the carrier indication information and the MCS according to a plurality of carrier measurement results reported by the UE; or, the base station determines the parameter of the CCA according to the statistical result; or the base station configures the same CCA parameter or the same CCA parameter set for the UE which is scheduled to the same subframe and has the geographical position within a predefined range; or, the base station determines the parameter of CCA of each UE according to the service type or priority of the UE; when the base station schedules a plurality of UEs to perform data transmission in the same subframe, the base station indicates the multiplexed UE to perform initial CCA only once at a predefined time; when only one UE is scheduled in one subframe, the base station configures a CCA mode that the UE adopts an initial CCA plus an extended CCA.

Further, the configuring, by the base station, the CCA parameter of the UE includes: the base station configures the difference between the starting position of the CCA executed by the UE and the starting time of data transmission as the length of an initial CCA; or, the base station configures that a difference between an initial time when the UE performs CCA and a start time of data transmission is equal to a length of the initial CCA plus unit time lengths of M performed extended CCAs, where M is a predefined integer value greater than or equal to 0; or, the base station configures that a difference between a time when the UE starts to perform the CCA and a start time of data transmission is equal to a length of an initial CCA plus a backoff value N plus unit time lengths of K executed extended CCAs, where K is a predefined integer value greater than or equal to 0.

Further, the subframe position of the uplink data is determined by one of the following modes: the position of each subframe where the uplink data transmission is located is determined according to a timing relation predefined by uplink authorization; or, the first subframe position of the uplink data transmission is determined according to the predefined timing relationship of the uplink authorization, and the remaining subframes are determined according to the subframe position indication information in the configuration signaling; or, all subframe positions of the uplink data transmission are determined according to the subframe position indication information in the configuration signaling.

Further, the receiving, by the base station, the uplink data sent by the UE according to the configuration signaling includes: the base station receives the uplink data transmitted by the UE from the first Orthogonal Frequency Division Multiplexing (OFDM) symbol of a subframe boundary; or, the base station receives the uplink data that the UE starts to transmit in the first complete OFDM symbol after the CCA is successful, or the uplink data that starts to transmit after the CCA is successful.

Further, when the base station configures a plurality of subframes for UE to transmit, the DCI of the plurality of subframes is carried by a PDCCH, wherein the positions of the plurality of subframes are indicated by a bitmap file, or the positions of the plurality of subframes are indicated by the number of starting subframes and consecutive subframes.

Further, the configuration signaling is DCI signaling and/or radio resource control RRC signaling.

According to another aspect of the present invention, there is provided a method of managing transmission of data, comprising: user Equipment (UE) receives a configuration signaling sent by a base station, wherein the configuration signaling carries a parameter of Clear Channel Assessment (CCA) of the UE and a parameter of uplink transmission of the UE; and the UE sends uplink data to the base station according to the configuration signaling.

Further, the sending, by the UE, uplink data to the base station according to the configuration signaling includes: when the backoff value or the counter value has been decreased to 0 before the uplink data transmission, the UE continues to perform the CCA until the uplink data transmission start boundary and a channel is clear to transmit the uplink data; or the UE enters a waiting state and sends the uplink data until the uplink data transmission moment; or the UE waits for the first time and then executes the initial CCA or the extended CCA with the unit length again at the predefined moment before the uplink data transmission, and the uplink data are sent after the initial CCA or the extended CCA with the unit length is executed successfully; or the UE sends an occupation signal, wherein the time domain length or the energy of the occupation signal is less than a predefined threshold; when the UE reaches the moment of transmitting the uplink data according to the predefined timing relation of uplink authorization and the value of the counter is not reduced to 0, the UE gives up the transmission of the uplink data, clears the value of the counter and starts to execute from the initial CCA again; or the UE continues to execute the extended CCA without clearing the counter value until the value of the counter is reduced to zero at the boundary of the scheduled subsequent subframe, and then the transmission of the uplink data is executed.

Further, the sending, by the UE, uplink data to the base station according to the configuration signaling includes: after the UE successfully performs the initial CCA for one time, the UE directly transmits retransmitted uplink data or uplink data with high priority, wherein the uplink data with high priority comprises acknowledgement ACK/non-acknowledgement NACK information, channel state feedback information CSI, a channel sounding reference signal SRS and a physical random access channel PRACH; the UE sends the initially transmitted uplink data or the uplink data of the self-scheduling UE after executing CCA successfully according to the size of a predefined or configured contention window or the backoff value; and the UE generates a random backoff value according to a predefined contention window or a variable contention window or transmits the uplink data after successfully executing CCA according to the backoff value configured by the base station, wherein the UE is the UE scheduled by crossing carriers.

Further, the sending, by the UE, uplink data to the base station according to the configuration signaling includes: when the UE continuously schedules a plurality of subframes, the UE executes CCA once before a first transmission subframe, and transmits the uplink data in the continuous subframes within the occupied time after the CCA is successfully executed; if UE scheduling exists in a subsequent subframe, the UE receives an indication signaling sent by the base station, wherein the indication signaling is used for informing the UE transmitting the uplink data to leave a last symbol of the subframe with a predefined or indicated time domain length for other UE CCAs, and a corresponding Physical Uplink Shared Channel (PUSCH) is discarded; or, the UE executes CCA at the position of the PRB where the scheduling is located according to the scheduling of the next subframe indicated by the base station; or, the UE executes CCA on the rest RB of the system bandwidth except the RB where the UE is continuously transmitted according to the scheduling transmission of the next subframe indicated by the base station; or, the UE transmits uplink data in the next subframe according to the scheduling of the indication information sent by the base station.

Further, the method further comprises: delaying, by the UE, execution of a CCA or transmission of the uplink data when a predefined delay period arrives.

Further, the method further comprises: and when the UE does not receive the CCA parameters sent by the base station, the UE selects the CCA mode and the CCA parameters to carry out CCA.

Further, the manner in which the UE performs CCA includes at least one of: each K subframes only comprise one initial CCA, and the CCA is positioned at the last symbol position of the subframe or the first symbol position of the subframe; each K subframes comprises a primary CCA and an extended CCA, wherein the initial position of the primary CCA is a predefined value, or the initial position is configured by the base station, and the difference between the position of the primary CCA and the initial time of data transmission is the sum of the duration of the primary CCA and the duration of M extended CCA units; wherein, K is an integer greater than or equal to 1, M is greater than or equal to a backoff value N of the extended CCA, N is configured by the base station or is a predefined value, or the UE randomly selects from [0, CW ], which is a predefined value, or CW is a variable value that is adjusted according to the base station feedback result or the UE performs CCA detection result adjustment.

Further, the length of the initial CCA and the unit duration of the extended CCA are predefined values.

Further, when the subframe for transmitting the uplink data is a subframe sent by a periodic or aperiodic channel Sounding Reference Signal (SRS), the subframe structure transmitted by the UE includes one of the following: the UE transmits the SRS in the last symbol of the subframe, wherein the subframe is used for knocking off a CCA idle area; other UE scheduled in the next subframe transmits the SRS at the position where the next subframe is scheduled by detecting the SRS; or, the UE transmitting the subframe enables other subframes to schedule the UE to transmit in the next subframe by means of predefined symbol RE muting, wherein a pattern of the predefined symbol RE muting is cell-specific; a physical uplink control channel (PUSCH) with the length of the CCA added to one symbol is dropped at the end of an uplink subframe, wherein the PUSCH is used for transmitting the SRS and the UE executing the CCA; transmitting the SRS at the start of the last symbol, wherein the total length of the SRS plus the CCA is equal to the length of 1 symbol; putting the SRS symbol to a first or predefined symbol position of a subframe for transmission, wherein the tail of the subframe is a free area for the UE to execute CCA;

and the SRS is sent at a position before the uplink data transmission subframe after the CCA is successfully executed.

According to still another aspect of the present invention, there is provided a data transmission apparatus, applied to a base station side, including: a first sending module, configured to send a configuration signaling to the UE, where the configuration signaling carries a parameter of a clear channel assessment CCA of the UE and a parameter of uplink transmission of the UE; and the first receiving module is used for receiving the uplink data sent by the UE according to the configuration signaling.

According to still another aspect of the present invention, there is provided a data transmission apparatus, applied to a UE side, including: a second receiving module, configured to receive a configuration signaling sent by a base station, where the configuration signaling carries a parameter of a clear channel assessment CCA of the UE and a parameter of uplink transmission of the UE; and the second sending module is used for sending uplink data to the base station according to the configuration signaling.

In the invention, a base station is adopted to send a configuration signaling to User Equipment (UE), wherein the configuration signaling carries parameters of a Clear Channel Assessment (CCA) of the UE and parameters of uplink transmission of the UE, and then the base station receives uplink data sent by the UE according to the configuration signaling, so that the problems of how to carry out LBT and realize multi-user frequency multiplexing on the uplink UE when an LTE system operates in an unauthorized carrier frequency band in the related art are solved, and the spectrum efficiency is improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

fig. 1 is a first flowchart of a data transmission method according to an embodiment of the present invention;

FIG. 2 is a second flowchart of a method for transmitting data according to an embodiment of the present invention;

FIG. 3 is a block diagram of a first apparatus for transmitting data according to an embodiment of the present invention;

FIG. 4 is a block diagram of a second embodiment of a data transmission apparatus;

fig. 5 is a schematic illustration of the LBT mechanism of a frame-based device FBE according to an alternative embodiment of the invention;

fig. 6 is a schematic diagram of the LBT mechanism of a load-based device LBE in accordance with an alternative embodiment of the present invention;

fig. 7 is a schematic diagram of a data transmission method provided by the present sending according to an alternative embodiment of the present invention;

fig. 8 is a schematic diagram of resource contention and data transmission according to an alternative embodiment of the present invention;

fig. 9 is a schematic diagram of resource contention and data transmission according to an alternative embodiment of the present invention;

fig. 10 is a diagram illustrating contention for resources and data transmission of a station in accordance with an alternative embodiment of the present invention;

fig. 11 is a schematic diagram of uplink data transmission according to an alternative embodiment of the present invention;

fig. 12 is a diagram illustrating an uplink subframe transmission scheme in accordance with an alternative embodiment of the present invention;

fig. 13 is a diagram illustrating uplink transmission schemes of two UEs in an eighth embodiment of the present invention;

fig. 14 is a diagram illustrating a method for SRS subframe transmission according to an alternative embodiment of the present invention;

fig. 15 is a diagram illustrating a method for uplink subframe transmission according to an alternative embodiment of the present invention;

fig. 16 is a flow diagram of a ten terminal side implementation according to an alternative embodiment of the invention;

fig. 17 is a flow chart of an eleven base station side implementation according to an alternative embodiment of the present invention.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

In this embodiment, a data transmission method is provided, and fig. 1 is a first flowchart of a data transmission method according to an embodiment of the present invention, as shown in fig. 1, the flowchart includes the following steps:

step S102: a base station sends a configuration signaling to User Equipment (UE), wherein the configuration signaling carries a parameter of a Clear Channel Assessment (CCA) of the UE and a parameter of uplink transmission of the UE;

step S104: and the base station receives uplink data sent by the UE according to the configuration signaling.

Through the steps S102 and S104 in this embodiment, a configuration signaling is sent to the UE by the base station, where the configuration signaling carries a parameter of a clear channel assessment CCA of the UE and a parameter of uplink transmission of the UE, and then the base station receives uplink data sent by the UE according to the configuration signaling, so that a problem of how to perform LBT and implement multi-user frequency multiplexing for the uplink UE when an LTE system operates in an unlicensed carrier frequency band in the related art is solved, and spectrum efficiency is improved.

The parameters of CCA and the parameters of uplink transmission involved in this embodiment may include at least one of the following: configuring, by a base station, a symbol position for CCA start, a window length CW of an extended CCA backoff value N, CCA for a UE; and the base station configures carrier indication information and subframe position indication information for data transmission on an unauthorized carrier, the position and the number of PRBs (physical resource blocks) allocated to each subframe, a Modulation and Coding Strategy (MCS) and a hybrid automatic repeat request (HARQ) process number for the UE.

In an optional implementation manner in this embodiment, the parameter of CCA and the parameter of uplink transmission may be determined in one of the following manners: the base station determines CCA parameters, carrier indication information and MCS according to a plurality of carrier measurement results reported by the UE; or, the base station determines the CCA parameters according to the statistical result; or the base station configures the same CCA parameter or the same CCA parameter set for the UE which is scheduled to the same subframe and has the geographical position within a predefined range; or, the base station determines the parameter of CCA of each UE according to the service type or priority of the UE; when a base station schedules a plurality of UE to transmit data in the same subframe, the base station indicates the multiplexed UE to perform initial CCA only once at a predefined moment; when only one UE is scheduled in one subframe, the base station configures a CCA mode that the UE adopts the initial CCA plus the extended CCA.

In addition, it should be noted that the CCA parameter configured by the base station for the UE in this embodiment includes: the base station configures the difference between the starting position of the CCA executed by the UE and the starting time of the data transmission as the length of an initial CCA; or, the base station configures that the difference between the initial time of executing the CCA and the starting time of data transmission by the UE is equal to the length of the initial CCA plus M unit durations of executing the extended CCA, where M is a predefined integer value greater than or equal to 0; or, the base station configures that the difference between the time when the UE starts to perform CCA and the start time of data transmission is equal to the length of the initial CCA plus a backoff value N plus K unit time lengths for performing extended CCA, where K is a predefined integer value greater than or equal to 0.

Optionally, the subframe position of the uplink data involved in this embodiment is determined by one of the following methods: the position of each subframe where uplink data transmission is located is determined according to a timing relation predefined by uplink authorization; or, the first subframe position of the uplink data transmission is determined according to the predefined timing relation of the uplink authorization, and the rest subframes are determined according to the subframe position indication information in the configuration signaling; or, all subframe positions of uplink data transmission are determined according to subframe position indication information in the configuration signaling.

In an optional implementation manner of this embodiment, the manner in which the base station receives uplink data sent by the UE according to the configuration signaling may be implemented by the following manner: a base station receives uplink data transmitted by UE from a first orthogonal frequency division multiplexing OFDM symbol of a subframe boundary; or, the base station receives uplink data which is transmitted by the UE at the first complete OFDM symbol after CCA is successful, or the uplink data which is transmitted at the beginning after CCA is successful.

Optionally, when the base station configures multiple subframes for UE to transmit, the DCI of the multiple subframes is carried by a PDCCH, where the multiple subframe positions are indicated by a bitmap file, or the multiple subframe positions are indicated by a starting subframe and a number of consecutive subframes.

It should be noted that the configuration signaling involved in this embodiment is DCI signaling and/or radio resource control RRC signaling.

Fig. 2 is a second flowchart of a data transmission method according to an embodiment of the present invention, and as shown in fig. 2, the method includes the steps of:

step S202: the method comprises the steps that User Equipment (UE) receives a configuration signaling sent by a base station, wherein the configuration signaling carries a parameter of a Clear Channel Assessment (CCA) of the UE and a parameter of uplink transmission of the UE;

step S204: and the UE sends uplink data to the base station according to the configuration signaling.

As mentioned in this embodiment, the parameters of CCA and the parameters of uplink transmission may include at least one of the following: configuring, by a base station, a symbol position for CCA start, a window length CW of an extended CCA backoff value N, CCA for a UE; and the base station configures carrier indication information and subframe position indication information for data transmission on an unauthorized carrier, the position and the number of PRBs (physical resource blocks) allocated to each subframe, a Modulation and Coding Strategy (MCS) and a hybrid automatic repeat request (HARQ) process number for the UE.

For the UE related to this embodiment to send uplink data to the base station according to the configuration signaling, this embodiment may be implemented as follows: when the backoff value or the counter value is already reduced to 0 before the uplink data transmission, the UE continues to execute CCA until the uplink data transmission starting boundary and the channel is idle, and the uplink data is not sent; or the UE enters a waiting state and sends uplink data until the uplink data transmission moment; or the UE waits for the first time and then executes the initial CCA or the extended CCA with the unit length again at the predefined moment before the uplink data transmission, and transmits the uplink data after the initial CCA or the extended CCA with the unit length is executed successfully; or the UE sends an occupation signal, wherein the time domain length or the energy of the occupation signal is less than a predefined threshold; when the UE reaches the moment of transmitting the uplink data according to the predefined timing relation of the uplink authorization and the value of the counter is not reduced to 0, the UE gives up the transmission of the uplink data, clears the value of the counter and starts to execute from the initial CCA again; or the UE does not clear the value of the counter and continues to execute the extended CCA until the value of the counter of the boundary of the scheduled subsequent subframe is reduced to zero, and then the transmission of the uplink data is executed.

In another optional implementation manner of this embodiment, the manner in which the UE sends the uplink data to the base station according to the configuration signaling may be implemented as follows: after the UE succeeds in primary CCA, the UE directly sends retransmitted uplink data or uplink data with high priority, wherein the uplink data with high priority comprises acknowledgement ACK/non-acknowledgement NACK information, channel state feedback information CSI, a channel sounding reference signal SRS and a physical random access channel PRACH; the UE sends the initially transmitted uplink data or the uplink data of the self-scheduling UE after executing CCA successfully according to the size of a predefined or configured contention window or a backoff value; and the UE generates a random backoff value or a backoff value configured by the base station according to a predefined contention window or a variable contention window and transmits the uplink data after successfully executing CCA, wherein the UE is the UE scheduled by crossing carriers.

In a further optional implementation manner of this embodiment, the manner in which the UE sends the uplink data to the base station according to the configuration signaling may be implemented as follows: when the UE continuously schedules a plurality of subframes, the UE executes CCA once before the first transmission subframe, and transmits uplink data in the continuous subframes within the occupied time after the CCA is successfully executed; if UE scheduling exists in a subsequent subframe, the UE receives an indication signaling sent by a base station, wherein the indication signaling is used for informing the UE transmitting uplink data to leave a space of a last symbol of the subframe with a predefined or indicated time domain length for other UE CCAs, and a corresponding physical uplink shared channel PUSCH is discarded; or the UE executes CCA at the position of the PRB where the scheduling is positioned according to the scheduling of the next subframe indicated by the base station; or, the UE executes CCA on the rest RB of the system bandwidth except the RB where the UE is continuously transmitted according to the scheduling transmission of the next subframe indicated by the base station; or, the UE transmits uplink data in the next subframe according to the scheduling of the indication information sent by the base station.

In addition, the method of the embodiment may further include:

the UE delays performing CCA or transmission of uplink data when a predefined delay period comes.

When the UE does not receive the CCA parameters sent by the base station, the UE selects the CCA mode and the CCA parameters to carry out CCA.

It should be noted that, the manner of performing CCA by the UE includes at least one of the following:

first, each K subframes includes only one initial CCA, and the CCA is located at the last symbol position of the subframe or the first symbol position of the subframe;

secondly, each K subframes comprises a primary CCA and an extended CCA, wherein the initial position of the primary CCA is a predefined value or is configured by a base station, and the difference between the position of the primary CCA and the initial time of data transmission is the sum of the duration of the primary CCA and the duration of M extended CCA units;

wherein, K is an integer greater than or equal to 1, M is greater than or equal to a backoff value N of the extended CCA, N is configured by the base station or is a predefined value, or UE randomly selects from [0, CW ], the CW is a predefined value, or CW is a variable value adjusted according to a base station feedback result or adjusted by the UE performing a CCA detection result; the length of the initial CCA and the unit duration of the extended CCA are predefined values.

It should be noted that, when the subframe for transmitting uplink data is a subframe transmitted by a periodic or aperiodic channel sounding reference signal SRS, the subframe structure for UE transmission includes one of the following:

the UE sends an SRS in the last symbol of a subframe, wherein the subframe is used for knocking off a clear area of CCA; other UE scheduled in the next subframe transmits the SRS at the position where the next subframe is scheduled by detecting the SRS; or, the UE transmitting the subframe enables other subframes to schedule the UE to transmit in the next subframe in a mode of the silent predefined symbol RE, wherein the pattern of the silent predefined symbol RE is specific to the cell;

a physical uplink control channel (PUSCH) with the length of one symbol plus CCA is knocked out at the end of an uplink subframe, wherein the PUSCH is used for sending an SRS and the UE executes CCA;

sending an SRS at the starting position of the last symbol, wherein the total length of the SRS and the CCA is equal to the length of 1 symbol;

putting symbols of the SRS to a first or predefined symbol position of a subframe for transmission, wherein the tail of the subframe is a free area for the UE to execute CCA;

and sending the SRS at the position before the uplink data transmission subframe after the CCA is successfully executed.

In this embodiment, a data transmission device is further provided, and the device is used to implement the foregoing embodiments and optional embodiments, which have already been described and are not described again. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.

Fig. 3 is a block diagram of a first structure of a data transmission apparatus according to an embodiment of the present invention, applied to a base station side, where the present embodiment corresponds to the method embodiment of fig. 1, and as shown in fig. 3, the apparatus includes: a first sending module 32, configured to send a configuration signaling to a user equipment UE, where the configuration signaling carries a parameter of a clear channel assessment CCA of the UE and a parameter of uplink transmission of the UE; and a first receiving module 34, coupled to the first sending module 32, configured to receive uplink data sent by the UE according to the configuration signaling.

Fig. 4 is a block diagram of a second structure of a data transmission apparatus according to an embodiment of the present invention, which is applied to a user equipment side, where the present embodiment corresponds to the method embodiment of fig. 2, and as shown in fig. 4, the apparatus includes: a second receiving module 42, configured to receive a configuration signaling sent by a base station, where the configuration signaling carries a parameter of a clear channel assessment CCA of the UE and a parameter of uplink transmission of the UE; and a second sending module 44, coupled to the second receiving module 42, configured to send uplink data to the base station according to the configuration signaling.

In addition, the method of the embodiment may further include:

The invention is illustrated below by means of alternative embodiments of the invention;

the data transmission method provided in this optional embodiment includes:

and the base station sends a scheduling signaling DCI to the scheduling UE. The scheduling signaling comprises: the UE carries out multi-subframe indication information of data transmission, and specific frequency domain resource position indication, carrier indication and other scheduling information in each subframe.

In addition, the base station may also configure the scheduling UE with CCA-related parameters, such as a CCA start position and/or a backoff value. In this optional embodiment, the base station configures the same CCA starting position and/or backoff value or configures the same CCA parameter set for UEs that are scheduled to have a geographic position difference smaller than a predefined threshold in the same subframe.

Optionally, the base station determines relevant parameters for performing LBT on the UE according to the service type and priority of the scheduling UE.

Optionally, the base station determines relevant parameters of LBT according to the number of UEs scheduled by the same subframe.

Optionally, before the base station determines the scheduling transmission parameter, the UE measures multiple unlicensed carriers and feeds back the result to the base station. This result is used for the base station to determine the specific carrier index scheduled by each UE, and to schedule UEs in the same subframe of the same carrier, and the base station to configure these UEs (if there is eCCA) with N value in random backoff in eCCA, where N is 3 or 2.

Optionally, the resource of the UE is determined by subframe and carrier index, for example, transmission is started from n + k (k is a predefined value) according to a timing relationship, 4 subframes are continuously scheduled, and then the subframe resource is indicated by signaling 1111bitmap or only the number of continuously scheduled subframes is indicated by 11.

Optionally, when the UE is scheduled to transmit in multiple consecutive subframes, the position of the first subframe is determined according to a predefined relationship between uplink grant and data transmission, and the remaining subframes are determined according to a subframe position indication in the scheduling signaling.

And the PUSCH data is transmitted from the first OFDM symbol of the uplink subframe, or the first complete OFDM symbol after the LBT is successful.

The base station configures LBT parameters for scheduling the UE, and the LBT parameters comprise: configuring the length of an initial CCA from the starting position of the CCA to the starting time of data transmission; or, configuring the difference t between the initial time of executing CCA by the UE and the time of transmitting data to be exactly equal to the length of the initial CCA plus the unit duration of M eCCAs each time; or, the difference t from the time of data transmission at the time when the UE is configured to start performing LBT is exactly equal to the length of the initial CCA plus a random backoff value N plus a unit duration of N eccas per time, where N is a predefined value.

Optionally, if the random backoff value N has been reduced to 0 before the time of data transmission, the UE continues to perform CCA until the subframe start boundary. Or the UE enters a waiting state until data transmission starts to transmit data at a data transmission time, or the UE waits first and then performs an initial CCA or eCCA of a unit length again at a predefined time before data transmission succeeds, and then transmits data, or the UE transmits an occupancy signal, where a time domain length of the occupancy signal is smaller than a predefined threshold.

And if the transmission time of the PUSCH is related to the timing, the value of N is still not reduced to 0, the UE abandons the transmission of the subframe, the counter N is cleared, the UE starts from the initial CCA again next time or the UE does not clear the N, the eCCA is continued, and if the boundary N of the uplink subframe of the subsequent scheduling is reduced to zero, the data transmission is directly carried out. Or the UE blindly detects the occupation signal and performs data transmission at the data transmission time when the UE of the cell is identified. Or the UE may CCA only on the scheduled RBs.

If the value of N is just reduced to 0, the moment of data transmission is the boundary of the subframe, and the UE directly carries out uplink transmission according to the subframe structure.

Optionally, when the UE does not receive the configuration information related to LBT sent by the base station, the UE performs CCA according to a predefined LBT method.

The predefined mode is as follows: the UE starts LBT k times after receiving the scheduling signaling.

Optionally, the LBT performed by the UE is as follows:

and the UE starts to perform initial CCA once at a position which is one time of the initial CCA before the data transmission, and performs the data transmission after the initial CCA is successful.

When the base station schedules a plurality of UEs to perform data transmission in the same subframe, the LBT scheme may be optionally used.

Or the UE starts LBT at a position which is a time length of an initial CCA plus N extended CCA units before data transmission, and performs data transmission after the LBT is successful, where N is a predefined value, and N is optionally less than or equal to 3.

Or the UE randomly selects a number from [0, CW ] as a random back-off value of the LBT at each time, wherein CW is a predefined value, and the selectable CW is less than or equal to 3.

Or the UE randomly selects a number from [0, CW ] as a random back-off value of the LBT each time, wherein CW is a variable value, and the adjustment is carried out according to a feedback result of the base station or a detection result of the UE.

Optionally, when the base station schedules only one UE in one subframe, the base station configures or predefines the LBT scheme for the UE.

Optionally, the base station configuration or the UE selecting a specific LBT mode is determined according to the data type: for retransmission data or a service with higher priority, the base station configures the UE with CCA only once. For the initial transmission data, the UE performs CCA according to a predefined contention window size or a predefined random backoff value. For the cross-carrier scheduled UE, the UE either generates a random backoff value or a base station configuration according to a predefined contention window itself, or the contention window is variable.

Optionally, when the UE scheduling manner is multi-subframe scheduling, if there is no subsequent UE performing CCA or the data transmission energy of the UE is smaller than the CCA detection threshold, the UE may continuously transmit multiple subframes. If UE scheduling continues, the base station gives an instruction to signal the length of the CCA left by the last symbol of the transmitted UE. Or, the UE scheduled by the next subframe performs CCA only at the PRB position where the scheduling is located. Or, the UE for transmission is scheduled in the next subframe, and CCA is carried out on the rest RBs after the system bandwidth excludes the RBs for continuously transmitting the UE. Or the base station sends indication information to the scheduled UE, which transmits in the next subframe even if CCA fails.

Optionally, when the UE is performing LBT and a delay period T arrives, the UE waits for delaying performing CCA or data transmission, and the value of T is a predefined value.

Optionally, an idle region, for example, one OFDM symbol, is located at the end of each uplink transmission subframe and is used for the UE to perform CCA.

Optionally, when the scheduled UE continuously transmits multiple subframes, if the next subframe does not schedule other UEs, the UE may continuously transmit multiple subframes. And if the next subframe has the scheduled UE, the base station sends an indication to the UE, and the UE leaves the last symbol of the subframe to be used for scheduling the UE in the next subframe to successfully execute CCA.

Optionally, when the subframe in which data is transmitted is exactly a subframe in which a periodic or aperiodic SRS is transmitted, the transmission subframe structure of the UE adopts one of the following:

the first method comprises the following steps: the SRS is sent at the last symbol of the subframe, the original idle area of the subframe is broken away, and other UE scheduled at the next subframe can also transmit at the position where the next subframe is scheduled by detecting the SRS. Or the UE of the sub-frame transmission realizes that other lower sub-frames schedule the UE to transmit in the lower sub-frame by a mode of pre-defining symbol RE multicasting, wherein the RE multicasting pattern is specific to the cell.

And the second method comprises the following steps: and a PUSCH with one symbol plus the CCA length is dropped at the end of the uplink subframe and is used for sending the SRS and other UE to do CCA.

And the third is that: the SRS is transmitted at the start of the last symbol and the total length of SRS plus CCA is equal to the length of 1 symbol.

And fourthly: and putting the SRS symbol to the first or other predefined symbol positions of the subframe for transmission, wherein the end of the subframe is still an Idle area for other UEs to do CCA.

And a fifth mode: SRS is transmitted at a position before the PUSCH transmission subframe after CCA success, such as on UpPTS.

And when the scheduled UE succeeds according to the LBT parameter CCA configured by the base station or selected by the UE, sending uplink data at the subframe position where the scheduling is located, and then performing blind detection at the corresponding position according to a predefined timing relation, or feeding back whether the base station performs data transmission by the UE, and receiving the data by the base station after receiving the feedback information.

The following describes the unlicensed carrier resource contention and data transmission method provided in the present invention in further detail with reference to the accompanying drawings and specific embodiments.

Example one

This embodiment briefly introduces the LBT method of a Frame-based device (FBE) and the LBT method of a Load-based device (LBE) for stations (base station, user Equipment, UE, home base station, relay station).

Fig. 5 is a schematic diagram of an LBT mechanism of an FBE of a frame-based device according to an alternative embodiment of the present invention, as shown in fig. 5, the FBE has a fixed transmission frame structure, a channel occupation time and an idle period constitute a fixed frame period, the device performs CCA detection in the idle period, when it is detected that a channel is idle, data transmission may be performed immediately, otherwise, CCA detection is performed again in the idle period of the next fixed frame period. For the european FBE, the channel occupancy time is 1ms to 10ms and the idle period is at least 5% of the channel occupancy time. The CCA detection is at least 20 μ s in duration, and may be based on energy detection or signal detection.

Fig. 6 is a schematic diagram of the LBT mechanism of a load-based device LBE according to an alternative embodiment of the present invention, as shown in fig. 6, for LBE, load-based contention. That is, when there is a need for data transmission, the device starts to perform CCA detection, and if the channel is found to be idle after the CCA detection is performed, data transmission may be performed immediately, and the maximum time that the data transmission may occupy is (13/32) × q ms, where q ═ 4,5,6 … 31,32} is configurable; otherwise, if the channel is found to be busy, an extended CCA (ecca) detection period is entered, that is, X CCA detections are performed, and the value of X is stored in a counter, where the value of X is randomly selected from 1 to q, which is called a random backoff value. Every CCA detection (same time for every CCA detection) the counter starts to decrement if the channel is found to be clear, the counter does not decrement if the channel is not clear, and when the counter is decremented to 0, data transmission can start, the data transmission time being determined by the requirements but not exceeding (13/32) × q ms at maximum.

Example two

This alternative embodiment explains a procedure in which the UE performs LBT according to the configuration information.

When the uplink action is based on LBT of FBE, assuming that the time when the base station sends the UL grant is n, the UE shall perform uplink data transmission at time n + k according to the timing relationship, where k is a predefined value, for example, k is less than or equal to 4 for FDD and is greater for TDD. The UE may perform CCA at a time t _ CCA from n + k, where t _ CCA is the duration of a predefined CCA or initial CCA, and may be 34 microseconds or 20 microseconds, for example. If the UE performs CCA successfully, the UE performs data transmission at time n + k, and if the UE fails, the UE cannot perform data transmission.

When the uplink is configured as the LBE-based LBT, assuming that the UE should perform uplink data transmission at time N + k according to the timing, the base station may configure the same eCCA backoff value N for the UE, in addition to configuring the same CCA starting position for the UE scheduled in the same subframe. And N is determined by the base station according to an empirical value or a result reported by the UE, or N is less than or equal to a predefined parameter K, and K can be 3 or 2. Or the backoff value of each UE is randomly generated by itself.

And, the base station notifies the scheduling UE through an RRC message or DCI.

The starting position of the CCA may be t ═ tica + M ×, t _ eCCA, M is greater than or equal to N, tica is the length of the initial CCA, t _ eCCA is the duration of each CCA in the eCCA, and may be the same as the duration of the initial CCA, or 1/M OFDM symbols, where M is 4, or 8, or each duration of the eCCA is 9 microseconds or 10 microseconds, or 16 microseconds.

Or the starting position of the CCA executed by the UE is a plurality of predefined positions, and the base station indicates which specific position starts through signaling.

For example, the starting positions of four CCAs are predefined, the last two symbol starting boundaries of a subframe, the last half symbol starting boundary of a subframe, the last symbol starting boundary of a subframe, and the last slot starting boundary of a subframe are several positions where the UE can perform CCA. The base station then indicates by 2bit signalling which specific position, say 00 indicates from the last slot boundary and 01 indicates from the last symbol boundary.

Or the base station informs the M value, and the UE calculates the position of the initial CCA according to the predefined length of the initial CCA and the eCCA unit time length. For example, the size of the base station informs that M is 5, the length of the predefined initial CCA is 34 microseconds, and the unit duration of the eCCA is 9 microseconds, the time when the UE starts to perform CCA should be 34+5 × 9 — 79 microseconds from the time of data transmission.

In this way, the UE backoff value N is randomly generated from [0, M ].

Then, the UE in the same subframe is scheduled to perform LBT according to the starting time of the indication signaling CCA. The value of N is decremented every time eCCA succeeds, whereas if not, the value of N is unchanged.

Normally, each UE should simultaneously reduce the value of N to 0 at the time of data transmission, and then simultaneously perform data transmission. Exceptions may occur.

For example, if the value of N of a scheduled UE is still not reduced to 0 by the time of N + k data transmission, the UE cannot perform data transmission at N + k. And the N value of the UE is cleared, the UE continues to decrease from the N value in the buffer next time, and if the UE continuously schedules a plurality of subframes, the UE can ensure the transmission in the next subframe. Or the UE starts again with the initial CCA the next time, the value of N returns to the initial value.

Or, blind detecting the occupied signals sent by other UEs, and if the detection is successful, performing data transmission at the time of data transmission.

If the value of a certain scheduled UE at a certain time N before the time of N + k data transmission has decreased to 0, the UE has two options:

the first method is as follows: the UE sends an occupation signal, and the duration of the occupation signal is less than a predefined value, so that the CCA execution failure of other UEs is not caused. And then wait until the specified data transmission time to perform data transmission.

The second method comprises the following steps: the UE continues to perform CCA.

Fig. 7 is a schematic diagram of a data transmission method provided by this sending in an optional embodiment two of the present invention, and as shown in fig. 7, three possible cases are given for different UEs to perform LBT, a base station schedules three UEs in the same subframe according to a result reported by the UEs, and configures the same CCA starting position for the three UEs, where the position and the subframe where data transmission is located satisfy t ═ tica + M × t _ ecca, and a value of N is configured to be 3. If it is empirically determined, the three UEs should be able to exactly complete eCCA for uplink data transmission at the time of predefined data transmission. Exceptions may occur, however, the exception handling: for example, if the value of the UE2 at the timing time N of data transmission is still not reduced to 0, the UE first subframe cannot transmit data, and if the value of the UE3 at the timing time N of data transmission is not reduced to 0, the UE still does not transmit data until the data timing time to transmit the uplink subframe.

EXAMPLE III

This optional embodiment specifically describes a method for implementing data synchronous transmission by multi-user CCA in LBE.

In order to achieve uplink scheduling, multiple UEs in the same subframe can perform data transmission simultaneously after CCA is completed, a common waiting time may be defined. The time is n eCCA times away from the time of data transmission, for example, n takes a value of 1 or 2. The time is used for the UE that successfully performs LBE contention in advance to wait for the UE that does not successfully perform contention to complete LBT within the time, and then the multiple UEs perform uplink data transmission together, thereby implementing FDM.

Fig. 8 is a schematic diagram of resource contention and data transmission according to an alternative embodiment of the present invention; as shown in fig. 8, it is assumed that the base station configures three UEs to simultaneously perform CCA at the same time, and the random backoff values are all 3, and a waiting time point t1 is defined, where t1 is a unit duration of 2 eccas from the start position of data transmission. For the UE1 to have successfully completed LBT before time t1, the UE enters a wait state before data transmission, waits for the duration of two eccas, and then transmits until the data transmission time. For a UE2 that has not yet completed LBT before time t1, the UE may continue CCA, and if the UE can complete LBT before data transmission, the UE may perform data transmission with other UEs that have completed LBT earlier, thereby achieving frequency reuse. For UE3, data transmission cannot be performed at the time of data transmission before data transmission because LBT is still not completed.

In this way, the back-off value for LBT by the UE may be configured by the base station, or may be generated by the UE independently.

Since wifi fastest access also takes 34 microseconds, a UE that has a CCA success earlier will not be snatched by wifi even if it does not send a signal within the waiting time.

Example four

The optional example continues to illustrate how to implement uplink multiuser multiplexing for the method provided by the present invention.

To ensure that the channel is free when the UE performs data transmission, after some UEs wait for a period of time after performing CCA, the CCA needs to be performed again before data transmission, for example, a predefined time duration, 34 microseconds, or 9 microseconds, or 10 microseconds. If successful, data can be transmitted, and if unsuccessful, data cannot be transmitted.

Fig. 9 is a schematic diagram of a resource contention and data transmission method in a fourth alternative embodiment of the present invention, as shown in fig. 9, a base station schedules three UEs to perform data transmission on the same subframe, and the base station configures the UE to perform CCA from a certain time or the UE performs CCA according to a predefined location and a random number N independently generated by the UE. Assuming that the UE1 generates a random backoff value of 5 and has been decremented to 0 before data transmission, the UE needs to enter a wait state and perform CCA again at a tecca time, such as 20 microseconds, or 10 microseconds, or 9 microseconds, before data transmission. At this moment, the UE may fail to detect the channel due to the sudden data transmission by other devices, such as wifi signals, and data transmission cannot be performed. Assuming that the UE2 independently generates a random backoff value of 7, and the UE immediately decreases the backoff value to 0 at the time before data transmission, the data transmission is performed directly. The random backoff value generated for UE3 is 9 and is decremented to 0 before data transmission, then the UE enters a delayed transmission data wait state and then performs CCA again at tecca time before data transmission, and if successful, the UE can perform data transmission.

EXAMPLE five

This alternative embodiment still details the execution of CCA by the UE.

The UE may specifically perform CCA in the following ways:

the first method is as follows: the UE performs LBT in FBE manner, i.e. only performs the initial CCA once at a time. For a service with higher priority, such as a retransmission service, or when the base station schedules multiple UEs to transmit in the same subframe in a multiplexing manner, or the UE finds that the scheduled RB is smaller than the uplink bandwidth, the method may be optionally used.

In this way, the starting position of the UE performing CCA is a predefined value, and is located at the end of the subframe and at the boundary of the ion frame for a duration of CCA, or starts from the starting symbol of the subframe and performs a length of CCA. Fig. 10 is a diagram illustrating contention of resource and data transmission of a station according to an alternative embodiment of the present invention, as shown in fig. 10.

The second method comprises the following steps: the CCA executed by the UE comprises an initial CCA and an extended CCA, and specific parameters are selected by the UE or configured by a base station.

This CCA approach may be optionally used when the UE schedules only one user in full bandwidth, i.e. one subframe.

And when the UE does not receive the corresponding LBT related configuration information of the base station, the UE carries out LBT according to the predefined LBT parameters.

The predefined parameters are: the contention window length CW of the random backoff of the UE CCA is a fixed value, e.g., 5,4 or 3 or 2. Each scheduling UE generates a random backoff value N from within 0, CW independently. Alternatively, the random backoff value of the UE is a predefined value, such as 2. Or the contention window length CW of the random backoff of the UE is variable, e.g., exponentially variable. Specifically, for example, the value of the first CW is 4, and after k failures of consecutive contention, the value of the CW is changed to 8 and then to 16.

Or the base station configures relevant parameters of LBT for the scheduling UE.

The method specifically comprises the following steps: the base station configures the position of the initial CCA and/or a backoff value N for the scheduling UE.

For example, the base station configures the starting position of the CCA to the scheduling UE with a time difference from data transmission that satisfies t ═ ticaca + M × t _ ecca. The UE then selects a random number from 1, M itself as the backoff value. Or the base station configures the same CCA position and the same backoff value or the same CCA parameter set for the UE with the geographical position within the predefined range.

If the UE completes LBT at a time prior to data transmission, the UE has four options: the UE continues to execute the CCA until data transmission, or the UE stops the CCA from entering and waiting until the data transmission moment for direct data transmission, or the UE stops waiting for a period of time, then performs the CCA again at the tcca moment away from the data transmission moment, and can not perform the data transmission if the CCA succeeds, otherwise, the data transmission cannot be performed. Or the UE always sends an occupied signal on the RB where the scheduling is located, or the UE sends an occupied signal in the full bandwidth, but the time is very short or the energy is smaller than a predefined threshold, which cannot prevent other UE CCA detection results from being idle.

If the LBT of the scheduling UE is still unsuccessful before the data transmission time, that is, the backoff value N is still not decreased to 0, the scheduling UE does not perform data transmission, or the scheduling UE detects an occupied signal sent by other UEs, and if it can be identified that the scheduling UE is sent by the UE of the local cell, the scheduling UE may also transmit data. Or the UE performs CCA once at a time tcca before the data transmission time, where the CCA is performed only on the RB where the scheduling is located, and if the RB is found to be idle, the UE may transmit data on the RB.

In addition, in the LBT or data transmission process, if the delay period T comes, the UE waits to delay CCA or data transmission, and continues CCA or data transmission after the time elapses.

EXAMPLE six

This alternative embodiment explains the uplink frame structure.

The frame structure may also be different depending on the situation in which the UE is scheduled.

Typically, an idle period is defined at the end of each subframe, and the length is, for example, an OFDM symbol length or other value for the UE to perform CCA. For the condition that a base station schedules a certain UE to transmit two or more continuous uplink subframes, the UE can perform CCA only once, and if the CCA is successful, the UE can continuously transmit the PRB corresponding to the N subframes meeting the scheduling in the occupied time for data transmission.

If there are other UEs performing CCA in the middle, the base station sends a signaling to notify the UE that the UE has the last symbol of the vacant subframe, fig. 11 is a schematic diagram of uplink data transmission in a sixth embodiment according to the present invention, as shown in fig. 11. Or

Other UEs only perform CCA on the scheduled PRB, and the position of the PRB is different from the RB position of the subframe of the UE that scheduled the multi-subframe transmission before. The UE may perform uplink data transmission on the corresponding scheduled RB after the UE succeeds on the scheduled PRB. Or

And the UE scheduled by the following subframe performs CCA on the rest RBs where the plurality of subframes UE are scheduled continuously.

For some cases, the base station may instruct the UE not to perform LBT but to perform data transmission directly. For example, the base station performs LBT first and successfully sends the downlink data, and the downlink transmission time does not exceed the maximum occupied time limit, at this time, the base station may instruct the UE to allow the UE to directly perform uplink data transmission without performing LBT again, but the sum of the uplink data transmission time and the previous base station downlink transmission time does not exceed the maximum occupied time limit.

EXAMPLE seven

This alternative embodiment explains a frame structure when the transmission subframe is an SRS subframe.

When the uplink subframe is just the subframe where the periodic SRS or the non-periodic SRS is transmitted, the SRS still transmits in the last symbol by the processing method. Fig. 12 is a diagram illustrating a transmission scheme of an uplink subframe in seven according to an alternative embodiment of the present invention, and a frame structure is shown in fig. 12.

In this way, the UE1 with successful contention transmits SRS in the last symbol, i.e. the subframe structure of the UE1 is the same as that of the legacy UE. Other UEs 2 scheduled by the same cell and other scheduled UEs start CCA at the designated CCA starting position according to the configuration and scheduling information of the base station. Since the UE1 transmits SRS on the carrier at this time, if busy is detected by channel detection, the UE may continue to attempt signal detection to determine whether it is the signal transmitted by the UE in the own cell. After the SRS of the same cell is detected, the transmission can be carried out in the next subframe. This may enable uplink multi-user FDM.

Or the base station indicates the UE not to perform CCA through the DCI and directly performs data transmission in the next subframe according to the scheduling signaling.

Or the UE for data transmission uses a predefined PUSCH symbol and RE multiplexing manner, for example, each RB has a dedicated multiplexing pattern, and the UE determines that the UE in the cell is transmitting data by detecting the pattern, and then can perform data transmission in the next subframe, so that it is ensured that the UE scheduled in the next subframe is not affected in the case of SRS transmission.

Example eight

This alternative embodiment still explains the frame structure when the transmission subframe is the SRS subframe.

When the uplink subframe is exactly the subframe where the periodic SRS or the aperiodic SRS is transmitted, another processing method is as follows: and reserving an idle area originally used for the UE to perform CCA and simultaneously transmitting the SRS at the tail of the subframe. The method specifically comprises the following two steps:

the first method comprises the following steps: the time domain length of an idle used for the UE to perform CCA is not changed, and the PUSCH of a symbol before the idle region is dropped to transmit the SRS, fig. 13 is a schematic diagram of uplink transmission mechanisms of two UEs in eighth embodiment according to the alternative embodiment of the present invention, as shown in fig. 13.

And the second method comprises the following steps: the length of the original SRS is compressed, the sum of the length of the idle is the length of one symbol, for example, the length of the CCA is 20 microseconds or 16 microseconds or 9 microseconds, and the remaining time of one other symbol is used for transmitting the SRS.

Example nine

When the uplink subframe is exactly the subframe where the periodic SRS or the aperiodic SRS is transmitted, in addition to the processing manners given in the seventh and eighth embodiments, the following processing manners may be further performed:

fig. 14 shows an initial first symbol of a subframe to put the SRS into, and fig. 14 is a schematic diagram of a method for SRS subframe transmission according to an alternative embodiment of the present invention. Or other predefined symbols. And, the PUSCH of the corresponding symbol position is knocked down, and the end of the subframe is still idle and is used for the UE to perform CCA.

Or, the SRS is transmitted at a position before the PUSCH subframe after the UE successfully performs CCA, for example, at the UpPTS, at this time, the frame structure is as shown in fig. 15, and fig. 15 is a schematic diagram of a method for uplink subframe transmission according to a ninth embodiment of the present invention. Specifically, when uplink and downlink are transmitted on an unlicensed carrier in a TDM manner, a base station is first used for downlink transmission for a period of time after preempting the unlicensed carrier, and a blank is defined in the middle before uplink transmission. On the one hand, for uplink and downlink switching, and on the other hand, for the UE to perform CCA before uplink transmission. After the UE successfully performs CCA, the SRS may be transmitted before the uplink subframe transmission. Or PRACH.

Example ten

The present optional embodiment explains a specific process of uplink data transmission performed by the UE.

Fig. 16 is a flowchart of a ten terminal side implementation according to an alternative embodiment of the invention, the process being as shown in fig. 16.

First, the UE receives uplink data transmission parameters or LBT related parameters through high layer signaling or physical DCI signaling.

The transmission parameters comprise carrier index information of the unauthorized carrier, subframe position index information of the UE for data transmission on the unauthorized carrier, the position and the number of PRBs (physical resource blocks) distributed by each subframe, a Modulation and Coding Strategy (MCS), and a hybrid automatic repeat request (HARQ) process number.

When the UE is scheduled to multiple subframes, the parameters of the subframes may be completely the same or partially the same, for example, the same PRB locations, or different PRB locations on each subframe.

The LBT correlation of (a) includes: the starting position of the CCA, the backoff value N, and the window length.

The carrier index and the backoff value transmitted by each subframe of the UE can be determined according to the measurement information reported by the UE.

Then, the UE performs LBT and data transmission according to the received parameters.

And if the CCA is successful at the predefined data transmission moment, the UE transmits uplink data according to the parameters in the scheduling signaling.

When the UE is scheduled to a consecutive plurality of subframes, the UE may continuously transmit the plurality of subframes after contending for the resource.

EXAMPLE eleven

This alternative embodiment illustrates the implementation process of the method provided by the present invention on the base station side.

Fig. 17 is a flow chart of an eleven base station side implementation of an alternative embodiment of the present invention, the process being as shown in fig. 17.

First, the base station determines the UEs scheduled in the same subframe, and the scheduling transmission parameters of each UE or the configuration parameters related to LBT performed by the UE.

Then, the base station notifies the relevant parameters of the UE through an RRC message or DCI.

And then, the base station performs blind detection and reception of uplink data according to the parameters, or notifies the base station after the UE sends the data, and receives the feedback information only after the base station receives the feedback information, and if the feedback information is not received or indicates that the UE does not perform data transmission, the base station does not need to perform receiving demodulation on the data.

In another embodiment, a software is provided, and the software is used for executing the technical solutions described in the above embodiments and optional implementation manners.

In another embodiment, a storage medium is provided, in which the software is stored, and the storage medium includes but is not limited to: optical disks, floppy disks, hard disks, erasable memory, etc.

It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented in a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented in program code that is executable by a computing device, such that they may be stored in a memory device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.

The above description is only an alternative embodiment of the present invention and is not intended to limit the present invention, and various modifications and variations of the present invention may occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for transmitting data, comprising:

a base station sends a configuration signaling to a User Equipment (UE), wherein the configuration signaling carries a parameter of Clear Channel Assessment (CCA) of the UE and a parameter of uplink transmission of the UE, and the parameter of the CCA and the parameter of the uplink transmission comprise at least one of the following parameters: configuring, by the base station, a symbol position where the CCA starts, an extended CCA backoff value N, and a window length CW of the CCA for the UE; the base station configures carrier indication information and subframe position indication information for data transmission on an unauthorized carrier, the position and number of PRBs (physical resource blocks) allocated to each subframe, a Modulation and Coding Strategy (MCS) and a hybrid automatic repeat request (HARQ) process number for the UE;

the base station receives uplink data sent by the UE according to the configuration signaling, wherein when the back-off value or the counter value is already reduced to 0 before the uplink data is transmitted, the UE continues to execute the CCA until the uplink data transmission starting boundary is reached and a channel is idle, so that the uplink data is not sent; or when the back-off value or the counter value is already reduced to 0 before the uplink data transmission, the UE enters a waiting state, and the uplink data is sent until the uplink data transmission moment; or when the backoff value or the counter value is already decreased to 0 before the uplink data transmission, the UE waits for performing the initial CCA or the extended CCA of the unit length again at a predefined time before the uplink data transmission, and transmits the uplink data after performing the initial CCA or the extended CCA of the unit length successfully; or when the back-off value or the counter value has been reduced to 0 before the uplink data transmission, the UE transmits an occupancy signal, the time domain length or the energy of which is smaller than a predefined threshold; when the UE reaches the moment of transmitting the uplink data according to the predefined timing relation of uplink authorization and the value of the counter is not reduced to 0, the UE gives up the transmission of the uplink data, clears the value of the counter and starts to execute from the initial CCA again; or when the UE reaches the time of transmitting the uplink data according to the predefined timing relation of the uplink authorization and the value of the counter is not reduced to 0, the UE does not clear the value of the counter and continues to execute the extended CCA until the value of the counter is reduced to zero at the scheduled subsequent subframe boundary, and then the transmission of the uplink data is executed;

the UE is also used for directly sending retransmitted uplink data or uplink data with high priority after primary initial CCA is successfully carried out, wherein the uplink data with high priority comprises acknowledgement ACK/non-acknowledgement NACK information, channel state feedback information CSI, a channel sounding reference signal SRS and a physical random access channel PRACH; the UE is also used for sending the initially transmitted uplink data or the uplink data of the self-scheduling UE after the CCA is executed successfully according to the size of a predefined or configured contention window or the backoff value; the UE is further configured to generate a random backoff value according to a predefined contention window or a variable contention window, or send the uplink data after the backoff is successfully performed by the base station, where the UE is a cross-carrier scheduled UE.

2. The method of claim 1, wherein the parameters for the CCA and the parameters for the uplink transmission are determined by one of:

the base station determines the CCA parameters, the carrier indication information and the MCS according to a plurality of carrier measurement results reported by the UE; or the like, or, alternatively,

the base station determines the CCA parameters according to the statistical result; or the like, or, alternatively,

the base station configures the same CCA parameter or the same CCA parameter set for the UE which is scheduled to the same subframe and has the geographical position distance within a predefined range; or the like, or, alternatively,

the base station determines the CCA parameter of each UE according to the service type or priority of the UE;

when the base station schedules a plurality of UEs to perform data transmission in the same subframe, the base station indicates the multiplexed UE to perform initial CCA only once at a predefined time; when only one UE is scheduled in one subframe, the base station configures a CCA mode that the UE adopts an initial CCA plus an extended CCA.

3. The method of claim 1, wherein the base station configuring the CCA parameters of the UE comprises:

the base station configures the difference between the starting position of the CCA executed by the UE and the starting time of data transmission as the length of an initial CCA; or the like, or, alternatively,

the base station configures that the difference between the initial time of executing CCA by the UE and the starting time of data transmission is equal to the length of the initial CCA plus M unit time lengths of executing the extended CCA, wherein M is a predefined integer value greater than or equal to 0; or the like, or, alternatively,

and the base station configures that the difference between the time when the UE starts to execute the CCA and the starting time of data transmission is equal to the length of the initial CCA plus a backoff value N plus the unit time length of K executed extended CCAs, wherein K is a predefined integer value greater than or equal to 0.

4. The method of claim 1, wherein the subframe location of the uplink data is determined by one of:

the position of each subframe where the uplink data transmission is located is determined according to a timing relation predefined by uplink authorization; or the like, or, alternatively,

the position of the first subframe of the uplink data transmission is determined according to the predefined timing relation of uplink authorization, and the rest subframes are determined according to subframe position indication information in the configuration signaling; or the like, or, alternatively,

and all subframe positions of the uplink data transmission are determined according to the subframe position indication information in the configuration signaling.

5. The method of claim 4, wherein the receiving, by the base station, the uplink data sent by the UE according to the configuration signaling comprises:

the base station receives the uplink data transmitted by the UE from the first Orthogonal Frequency Division Multiplexing (OFDM) symbol of a subframe boundary; or the like, or, alternatively,

and the base station receives the uplink data which is transmitted by the UE at the first complete OFDM symbol after the CCA is successful, or the uplink data which is transmitted at the beginning after the CCA is successful.

6. The method of claim 4,

when the base station configures a plurality of subframes for UE to transmit, the downlink control information DCI of the subframes is loaded through a physical downlink control channel PDCCH, wherein, the positions of the subframes are indicated by bitmap file, or the positions of the subframes are indicated by the number of initial subframes and continuous subframes.

7. The method of claim 1, wherein the configuration signaling is DCI signaling and/or Radio Resource Control (RRC) signaling.

8. A method for transmitting data, comprising:

user Equipment (UE) receives a configuration signaling sent by a base station, wherein the configuration signaling carries a parameter of Clear Channel Assessment (CCA) of the UE and a parameter of uplink transmission of the UE, and the parameter of the CCA and the parameter of the uplink transmission comprise at least one of the following parameters: configuring, by the base station, a symbol position where the CCA starts, an extended CCA backoff value N, and a window length CW of the CCA for the UE; the base station configures carrier indication information and subframe position indication information for data transmission on an unauthorized carrier, the position and number of PRBs (physical resource blocks) allocated to each subframe, a Modulation and Coding Strategy (MCS) and a hybrid automatic repeat request (HARQ) process number for the UE;

the UE sends uplink data to the base station according to the configuration signaling;

wherein the sending, by the UE, uplink data to the base station according to the configuration signaling includes: when the backoff value or the counter value has been decreased to 0 before the uplink data transmission, the UE continues to perform the CCA until the uplink data transmission start boundary and a channel is clear to transmit the uplink data; or when the back-off value or the counter value is already reduced to 0 before the uplink data transmission, the UE enters a waiting state, and the uplink data is sent until the uplink data transmission moment; or when the backoff value or the counter value is already decreased to 0 before the uplink data transmission, the UE waits for performing the initial CCA or the extended CCA of the unit length again at a predefined time before the uplink data transmission, and transmits the uplink data after performing the initial CCA or the extended CCA of the unit length successfully; or when the back-off value or counter value has decreased to 0 before the uplink data transmission, the UE transmits an occupancy signal, wherein a time domain length or energy of the occupancy signal is less than a predefined threshold; when the UE reaches the moment of transmitting the uplink data according to the predefined timing relation of uplink authorization and the value of the counter is not reduced to 0, the UE gives up the transmission of the uplink data, clears the value of the counter and starts to execute from the initial CCA again; or when the UE reaches the time of transmitting the uplink data according to the predefined timing relation of the uplink authorization and the value of the counter is not reduced to 0, the UE does not clear the value of the counter and continues to execute the extended CCA until the value of the counter is reduced to zero at the scheduled subsequent subframe boundary, and then the transmission of the uplink data is executed;

wherein the sending, by the UE, uplink data to the base station according to the configuration signaling includes: after the UE successfully performs the initial CCA for one time, the UE directly transmits retransmitted uplink data or uplink data with high priority, wherein the uplink data with high priority comprises acknowledgement ACK/non-acknowledgement NACK information, channel state feedback information CSI, a channel sounding reference signal SRS and a physical random access channel PRACH; the UE sends the initially transmitted uplink data or the uplink data of the self-scheduling UE after executing CCA successfully according to the size of a predefined or configured contention window or the backoff value; and the UE generates a random backoff value according to a predefined contention window or a variable contention window or transmits the uplink data after successfully executing CCA according to the backoff value configured by the base station, wherein the UE is the UE scheduled by crossing carriers.

9. The method of claim 8, wherein the UE sending uplink data to the base station according to the configuration signaling comprises:

when the UE continuously schedules a plurality of subframes, the UE executes CCA once before a first transmission subframe, and transmits the uplink data in the continuous subframes within the occupied time after the CCA is successfully executed; if UE scheduling exists in a subsequent subframe, the UE receives an indication signaling sent by the base station, wherein the indication signaling is used for informing the UE transmitting the uplink data to leave a last symbol of the subframe with a predefined or indicated time domain length for other UE CCAs, and a corresponding Physical Uplink Shared Channel (PUSCH) is discarded; or the like, or, alternatively,

the UE executes CCA at the position of the PRB where the scheduling is located according to the scheduling of the next subframe indicated by the base station; or the like, or, alternatively,

the UE executes CCA on the rest RB of the system bandwidth except the RB where the UE is continuously transmitted according to the scheduling transmission of the next subframe indicated by the base station; or the like, or, alternatively,

and the UE transmits uplink data in the next subframe according to the scheduling of the indication information sent by the base station.

10. The method of claim 8, further comprising: delaying, by the UE, execution of a CCA or transmission of the uplink data when a predefined delay period arrives.

11. The method of claim 8, further comprising:

and when the UE does not receive the CCA parameters sent by the base station, the UE selects the CCA mode and the CCA parameters to carry out CCA.

12. The method of claim 8 or 9, wherein the manner in which the UE performs CCA comprises at least one of:

each K subframes only comprise one initial CCA, and the CCA is positioned at the last symbol position of the subframe or the first symbol position of the subframe;

each K subframes comprises a primary CCA and an extended CCA, wherein the initial position of the primary CCA is a predefined value, or the initial position is configured by the base station, and the difference between the position of the primary CCA and the initial time of data transmission is the sum of the duration of the primary CCA and the duration of M extended CCA units;

wherein, K is an integer greater than or equal to 1, M is greater than or equal to a backoff value N of the extended CCA, N is configured by the base station or is a predefined value, or the UE randomly selects from [0, CW ], which is a predefined value, or CW is a variable value that is adjusted according to the base station feedback result or the UE performs CCA detection result adjustment.

13. The method of claim 12, wherein a length of the initial CCA and a unit time length of an extended CCA are predefined values.

14. The method of claim 8, wherein when the subframe in which the uplink data is transmitted is a subframe in which a periodic or aperiodic channel Sounding Reference Signal (SRS) is transmitted, the subframe structure of the UE transmission comprises one of:

the UE transmits the SRS in the last symbol of the subframe, wherein the subframe is used for knocking off a CCA idle area; other UE scheduled in the next subframe transmits the SRS at the position where the next subframe is scheduled by detecting the SRS; or, the UE transmitting the subframe enables other subframes to schedule the UE to transmit in the next subframe by means of predefined symbol RE muting, wherein a pattern of the predefined symbol RE muting is cell-specific;

a physical uplink control channel (PUSCH) with the length of the CCA added to one symbol is dropped at the end of an uplink subframe, wherein the PUSCH is used for transmitting the SRS and the UE executing the CCA;

transmitting the SRS at the start of the last symbol, wherein the total length of the SRS plus the CCA is equal to the length of 1 symbol;

putting the SRS symbol to a first or predefined symbol position of a subframe for transmission, wherein the tail of the subframe is a free area for the UE to execute CCA;

15. A data transmission device applied to a base station side comprises:

a first sending module, configured to send a configuration signaling to a user equipment UE, where the configuration signaling carries a parameter of a clear channel assessment CCA of the UE and a parameter of uplink transmission of the UE, where the parameter of the CCA and the parameter of the uplink transmission include at least one of: configuring, by the base station, a symbol position where the CCA starts, an extended CCA backoff value N, and a window length CW of the CCA for the UE; the base station configures carrier indication information and subframe position indication information for data transmission on an unauthorized carrier, the position and number of PRBs (physical resource blocks) allocated to each subframe, a Modulation and Coding Strategy (MCS) and a hybrid automatic repeat request (HARQ) process number for the UE;

a first receiving module, configured to receive uplink data sent by the UE according to the configuration signaling, where when the backoff value or the counter value has been decreased to 0 before the uplink data transmission, the UE continues to perform the CCA until an uplink data transmission start boundary is reached and a channel is idle, so as to send the uplink data; or when the back-off value or the counter value is already reduced to 0 before the uplink data transmission, the UE enters a waiting state, and the uplink data is sent until the uplink data transmission moment; or when the backoff value or the counter value is already decreased to 0 before the uplink data transmission, the UE waits for performing the initial CCA or the extended CCA of the unit length again at a predefined time before the uplink data transmission, and transmits the uplink data after performing the initial CCA or the extended CCA of the unit length successfully; or when the back-off value or the counter value has been reduced to 0 before the uplink data transmission, the UE transmits an occupancy signal, the time domain length or the energy of which is smaller than a predefined threshold; when the UE reaches the moment of transmitting the uplink data according to the predefined timing relation of uplink authorization and the value of the counter is not reduced to 0, the UE gives up the transmission of the uplink data, clears the value of the counter and starts to execute from the initial CCA again; or when the UE reaches the time of transmitting the uplink data according to the predefined timing relation of the uplink authorization and the value of the counter is not reduced to 0, the UE does not clear the value of the counter and continues to execute the extended CCA until the value of the counter is reduced to zero at the scheduled subsequent subframe boundary, and then the transmission of the uplink data is executed;

16. A data transmission device applied to a User Equipment (UE) side is characterized by comprising:

a second receiving module, configured to receive a configuration signaling sent by a base station, where the configuration signaling carries a parameter of a clear channel assessment CCA of the UE and a parameter of uplink transmission of the UE, where the parameter of the CCA and the parameter of the uplink transmission include at least one of: configuring, by the base station, a symbol position where the CCA starts, an extended CCA backoff value N, and a window length CW of the CCA for the UE; the base station configures carrier indication information and subframe position indication information for data transmission on an unauthorized carrier, the position and number of PRBs (physical resource blocks) allocated to each subframe, a Modulation and Coding Strategy (MCS) and a hybrid automatic repeat request (HARQ) process number for the UE;

a second sending module, configured to send uplink data to the base station according to the configuration signaling;

the second sending module is further configured to, when the backoff value or the counter value has been decreased to 0 before the uplink data transmission, continue to perform the CCA until the uplink data transmission start boundary and a channel is idle, so as to send the uplink data; or when the back-off value or the counter value is already reduced to 0 before the uplink data transmission, entering a waiting state, and sending the uplink data until the uplink data transmission moment; or when the backoff value or the counter value is already reduced to 0 before the uplink data transmission, waiting for performing the initial CCA or the extended CCA of the unit length again at a predefined time before the uplink data transmission, and transmitting the uplink data after the initial CCA or the extended CCA of the unit length is successfully performed; or when the back-off value or the counter value is already reduced to 0 before the uplink data transmission, sending an occupancy signal, wherein the time domain length or the energy of the occupancy signal is smaller than a predefined threshold; when the UE reaches the moment of transmitting the uplink data according to the predefined timing relation of uplink authorization and the value of the counter is not reduced to 0, giving up the transmission of the uplink data, clearing the value of the counter, and starting execution from the initial CCA again; or when the UE reaches the time of transmitting the uplink data according to the predefined timing relation of the uplink authorization and the value of the counter is not reduced to 0, the value of the counter is not cleared, the extended CCA is continuously executed until the value of the counter is reduced to zero at the scheduled subsequent subframe boundary, and the uplink data transmission is executed;